spike: embedded code samples rework

[fundthmcalculus]

• Injected code sample tabs are now created by a macro for consistency and simplicity
• There is an additional output on protoc-gen-sdk which creates all endpoints in the docs/reference/services-generated folder so you can copy-paste the new endpoints over. feat: Add Docs as a new target protoc-gen-sdk#55
• Working on the Dart samples of the new layout
• Required code files are added in the necessary locations, if you need/want to move them to a subfolder, we can, just talk to me so I can update the macro.

[github-actions]

Preview docs site for 1759-embedded-code-samples@5b199948
Changed paths:

1. docs/reference/index.md
2. docs/reference/services/accessmanagement-service.md
3. docs/reference/services/account-service.md
4. docs/reference/services/credential-service.md
5. docs/reference/services/file-management-service.md
6. docs/reference/services/provider-service.md
7. docs/reference/services/template-service.md
8. docs/reference/services/trust-registry-service.md
9. docs/reference/services/wallet-service.md

[github-actions]

Preview docs site for 1759-embedded-code-samples@678d877a
Changed paths:

1. docs/reference/index.md
2. docs/reference/services/accessmanagement-service.md
3. docs/reference/services/account-service.md
4. docs/reference/services/credential-service.md
5. docs/reference/services/file-management-service.md
6. docs/reference/services/provider-service.md
7. docs/reference/services/template-service.md
8. docs/reference/services/trust-registry-service.md
9. docs/reference/services/wallet-service.md

[github-actions]

Preview docs site for 1759-embedded-code-samples@d4a26c9d
Changed paths:

1. docs/reference/index.md
2. docs/reference/proto/index.md
3. docs/reference/services/accessmanagement-service.md
4. docs/reference/services/account-service.md
5. docs/reference/services/credential-service.md
6. docs/reference/services/file-management-service.md
7. docs/reference/services/provider-service.md
8. docs/reference/services/template-service.md
9. docs/reference/services/trust-registry-service.md
10. docs/reference/services/wallet-service.md

[tmarkovski]

Bump. Is this work still pending or can we close this? @fundthmcalculus

[fundthmcalculus]

This was work that needed to be done, but was put on hold per @janpieterz . Happy to have a further discussion about the need for it's completion, but there's still work to do.

[janpieterz]

I think we can cancel the work of "all languages". But this pull request might contain some changes that are useful regardless/outside of that. Are there any?

[fundthmcalculus]

I think we can cancel the work of "all languages". But this pull request might contain some changes that are useful regardless/outside of that. Are there any?

There is, let me go though it and extract out the useful bits. The goal of this was to automate a lot of the sample generation so it's clearer where to put things.